If no T1w is present, attempt to deface with a template t1w contained in petdeface/data/*

[bendhouseart]

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📚 Documentation preview 📚: https://petdeface--55.org.readthedocs.build/en/55/

[bendhouseart]

Okay I still need to validate that using the sub-01_T1w.nii image in lieu of a missing T1w is useful, but this branch is almost ready to run automatically on my assembled datasets to do so:

• Increase DOF to 12 when a "T1w" is being used that doesn't belong to the PET subject
• Update --no-anat flag to accept multiple options (use stock sub-01_T1w.nii, average the subject's pet image, use sub-mni305_t1w.nii, etc etc). Planning on limiting use to templates/anatomical contained within the repo/library as a user always has the option of supplying their own T1w via placing that file in a subjects folder.
• Run the updated pipeline on MC1, PS13, and TSPO data.
• Add a notebook to compare runs.

Comparison between the T1w-less and outputs and the data with the correct T1w's will tell the ultimate story.